Author Topic: Brown Stain in Corny Keg  (Read 1738 times)

Offline johnnyb

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Brown Stain in Corny Keg
« on: August 29, 2015, 06:59:49 PM »
Just getting around to cleaning some corny kegs a friend gave me, and I have one with a brownish stain in the bottom that I can't remove. It is probably a spot where a bit of liquid (assuming beer because he was a brewer but who knows) pooled for a long period of time. It's not a solid brown spot. It's more like sort of haphazard rings of various shades of brown and roughly 3" across.

So far I've tried PBW, Craft Meister Alkaline Brewery Wash, and StarSan with no luck.

I just want to use this keg for periodic cleaning of beer lines, so I'm not sure if the stain is a big deal. But I would feel better if I could get it cleaned up.

Any ideas? 

Offline narcout

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Re: Brown Stain in Corny Keg
« Reply #1 on: August 29, 2015, 08:22:27 PM »
Bar Keeper's Friend
It's too close to home
And it's too near the bone

Offline Philbrew

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Re: Brown Stain in Corny Keg
« Reply #2 on: August 29, 2015, 10:25:17 PM »
Might be rust.  Passivate the SS with a couple cups of muriatic acid.
Many of us would be on a strict liquid diet if it weren't for pretzels.

Offline Wort-H.O.G.

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Re: Brown Stain in Corny Keg
« Reply #3 on: August 29, 2015, 10:32:05 PM »
Might be rust.  Passivate the SS with a couple cups of muriatic acid.

my bet its in a blemish in the glass....from production. i have one with the same thing...brownish spot on bottom and its clearly in the layer of glass.

throw crap ton of oxyclean in there..if it doesn't come out its likely in the glass.
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Offline hopfenundmalz

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Re: Brown Stain in Corny Keg
« Reply #4 on: August 29, 2015, 10:33:44 PM »
Might be rust.  Passivate the SS with a couple cups of muriatic acid.

my bet its in a blemish in the glass....from production. i have one with the same thing...brownish spot on bottom and its clearly in the layer of glass.

throw crap ton of oxyclean in there..if it doesn't come out its likely in the glass.
Glass in a corny keg???
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Offline Wort-H.O.G.

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Re: Brown Stain in Corny Keg
« Reply #5 on: August 29, 2015, 10:35:05 PM »
Might be rust.  Passivate the SS with a couple cups of muriatic acid.

my bet its in a blemish in the glass....from production. i have one with the same thing...brownish spot on bottom and its clearly in the layer of glass.

throw crap ton of oxyclean in there..if it doesn't come out its likely in the glass.
Glass in a corny keg???

haha my bad. i could have sworn i read carboy....only had one beer so far  ::)
Ken- Chagrin Falls, OH
CPT, U.S.Army
https://www.facebook.com/pages/Harveys-Brewhaus/405092862905115

http://braukaiser.com/wiki/index.php?title=The_Science_of_Mashing

Serving:        In Process:
Vienna IPA          O'Fest
Dort
Mead                 
Cider                         
Ger'merican Blonde
Amber Ale
Next:
Ger Pils
O'Fest

Offline hopfenundmalz

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Re: Brown Stain in Corny Keg
« Reply #6 on: August 29, 2015, 10:38:34 PM »
Might be rust.  Passivate the SS with a couple cups of muriatic acid.
Isn't Nitric acid used to passivate SS in industrial settings, as it is an oxidizer.
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Offline johnnyb

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Re: Brown Stain in Corny Keg
« Reply #7 on: August 29, 2015, 11:10:44 PM »
I guess it could be rust, but it sure doesn't look like rust. I can't imagine what else it could be though that wouldn't have come off with the cleaners that I've tried.

Can I use phosphoric acid? And if yes, how much should I dilute it?


Offline hopfenundmalz

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Re: Brown Stain in Corny Keg
« Reply #8 on: August 29, 2015, 11:28:46 PM »
Here is advice from a metallurgist named Palmer. Bar Keepers Friend is the source of oxalic acid. You might need someone with skinny arms to reach the bottom to scrub.
http://www.howtobrew.com/appendices/appendixB-1.html
« Last Edit: August 30, 2015, 12:26:24 AM by hopfenundmalz »
Jeff Rankert
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Home-brewing, not just a hobby, it is a lifestyle!

Offline johnnyb

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Re: Brown Stain in Corny Keg
« Reply #9 on: August 30, 2015, 12:11:28 AM »
Thanks.

Offline Slowbrew

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Re: Brown Stain in Corny Keg
« Reply #10 on: August 30, 2015, 11:58:10 AM »
Here is advice from a metallurgist named Palmer. Bar Keepers Friend is the source of oxalic acid. You might need someone with skinny arms to reach the bottom to scrub.
http://www.howtobrew.com/appendices/appendixB-1.html

One of those sponge on one side and scrubby pad on the other and a broom handle can work in place of the skinny arm too.

Paul
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Offline zorch

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Re: Brown Stain in Corny Keg
« Reply #11 on: August 30, 2015, 05:14:04 PM »
Here is advice from a metallurgist named Palmer. Bar Keepers Friend is the source of oxalic acid. You might need someone with skinny arms to reach the bottom to scrub.
http://www.howtobrew.com/appendices/appendixB-1.html

I keep a toilet bowl brush (never used on a toilet, of course) for keg scrubbing duties.

Offline brewinhard

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Re: Brown Stain in Corny Keg
« Reply #12 on: August 30, 2015, 05:16:35 PM »
You might need someone with skinny arms to reach the bottom to scrub.

Ha!  I know exactly what you are talking about.  Got my arm caught in one a few weeks back.  Next time I will hold my wife upside down by her legs and let her go in for a good cleaning. 

Offline Stevie

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Re: Brown Stain in Corny Keg
« Reply #13 on: August 30, 2015, 05:42:12 PM »
My arms are just long and skinny enough to get shoulder deep into a keg allowing me to rest my palm flat on the bottom. Makes my yearly deep clean and rebuild easier.

Offline reverseapachemaster

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Re: Brown Stain in Corny Keg
« Reply #14 on: August 30, 2015, 06:52:35 PM »
You might need someone with skinny arms to reach the bottom to scrub.

Ha!  I know exactly what you are talking about.  Got my arm caught in one a few weeks back.  Next time I will hold my wife upside down by her legs and let her go in for a good cleaning.

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